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The ubiquitin ligase Siah2 and the hypoxia response Nakayama K; Qi J; Ronai ZMol Cancer Res 2009[Apr]; 7 (4): 443-51Growing evidence indicates that ubiquitin ligases play a critical role in the hypoxia response. Among them, Siah2, a RING finger ligase, is an important regulator of pathways activated under hypoxia. Siah2 regulates prolyl hydroxylases PHD3 and 1 under oxygen concentration of 2% to 5%, thereby allowing accumulation of hypoxia-inducible factor (HIF)-1alpha, a master regulator of the hypoxia response within the range of physiological normoxic to mild hypoxic conditions. Growing evidence also indicates an important function for Siah2 in tumor development and progression based on pancreatic cancer, mammary tumor, and melanoma mouse models. This review summarizes our current understanding of Siah2 regulation and function with emphasis on hypoxia and tumorigenesis.|Amino Acid Sequence[MESH]|Animals[MESH]|Humans[MESH]|Hypoxia/*metabolism[MESH]|Molecular Sequence Data[MESH]|Nuclear Proteins/*physiology[MESH]|Seven in Absentia Proteins[MESH]|Ubiquitin-Protein Ligases/*physiology[MESH] |
